With the support of the French Navy, Washington and Lafayette laid siege to the city and engaged Cornwallis' troops in the fields around it for the next three weeks. The British were unable to either escape or provide reinforcements due to the success of the French with the Battle of the Chesapeake, allowing for a French naval blockade of the Chesapeake Bay. Aside from Connor's assistance in the blockade, the Colonial Assassins also covertly aided the American command on land, eliminating British threats as the battle went on.

With the American-French army gaining ground after several skirmishes, the British situation began to rapidly deteriorate and Cornwallis offered to negotiate the terms of his surrender on 17 October. Two days later, the British Army formally surrendered.